by Dixon, M.M., Nicholson, H., Shewchuk, L., Baase, W.A., Matthews, B.W.
Published in Journal of molecular biology (05.10.1992)

by Dixon, M. M, Matthews, Brian W
Published in Biochemistry (Easton) (22.08.1989)

by Dixon, M.M, Fogarty, W.M
Published in Bio-chemical journal (1974)